Electric heater.



n c. C. HBYDER.

ELECTRIC HEATER. 111.1011103 FILED 1116.31, 1912.

Patented May 13, 1913.

Y WMU/@ .25 drawing which forms a part of this appli- UNITED STATES PATENT' oFFica.

CHARLES HEYDER OF HANSFORD, WEST VIRGINIA.

ELECTRIC HEATER.

` Specicatioii of Letters Patent.

Application died August 3 1, i912. Serial No. 718,083.

Patented May 13, 1913.

To all whom t may concern.' y

Be itknown that I, CHARLES C. HEYDER, a citizen of the United States, residing at Hansford, .inl the countyof Kanawha and State of West Virginia, have invented new and useful Improvements yin Electric Heaters, of which the following is a specification. vThis invention relates to electric heaters and more particularly to that type'which is adapted to heat cauteries or like instruments.

One of the principal objects of the invention is to construct the heating unit in such a manner that it is se arable from its inclosing casing so that sliould one of the coils burn out the entire heating unit may be removed from the casing and the damage repaired or a new unit substituted.

Another object of the invention is the provision of a sim le and eti'icient device of this character whic mayf be cheaply constructed and which will be durable and convenient to l handle.

Further objects of this .invention will appear as the following specific description is read in connection with' the accompanying f cation, and in which Figure 1 is a perspective view of the device showing a cautery oint arranged therein. Fig. 2 is vasimi ar `view withv parts broken 'away and with the heating unit removed. Fig. -3 is a side elevation of the heating unit with parts broken away. Fig. 4 is a detail vertical sectional view through the device.

Referring more particularly to the drawings 1 represents a base having secured thereupon by means of the screws 2 a rectangularshell or casing 3 which is closed at its upper end by a lid or cover 4 provided with a plurality of apert-ures 5 or a urpose to be hereinafter described. The lit or cover 4 is also secured upon the casing by means of screws 6 so as to be readily removable when it is desired to remove the heating unit to be hereinafter described. Leading into the casing are the terminal pins 7 which are insulated therefrom bythe bushings 84 and have connect-ing to their inner ends suitable contacting springs 9 arranged in parallelism above the base 1 which is preferably of insulating material.

The heating units comprise point or vinstrument receiving tubes 10 constructed of any suitable dielectricmaterial by preferably having high heat conducting qualit-ies. These tubes have spirally wound aroundthe' same a. wire 11 of. high electrical resistance in the form of heating coils whose terminals". l are connected at one end thereof and at the 60 opposite end are'secured to contactpoints 12 arranged in position to engage the springs 9. Thel coils and their supporting tubes are embedded in a block of insulating material.vv 13 which fits the interior of the casing 3 and 65 is held in position with the terminals 12 in engagement with the springs 9 by means of the cover 4. The ins 7 are so arrangedl with 'respect to each ot er as to :Liake connection,

with a coupling socket carried by a flexible 7o conductor which may be connected vin the ordinary incandescent lamp circuit.

Secured to the casing and to the base is a, manipulating handle 14 by which the heater may be carried from point to point.

The holes 5 in the cover register with the tubes 10 so that cautery points may be inserted into the tubes and allowed to remain therein while the current is on until fully heated. What is claimed is LA heater comprising a metallic casing, contact terminals' carried by but insulated from the casing, spring contacts connected to the terminals and extendin into the cas- 35.;

ing and insulated heating coils removably Y mountedvin the casing and having their ter-l minals arranged to engage said spring con-,. tacts together with an apertured cover for holding the coil .terminals -in engagement with the 'spring contacts.

2. An electrical heater comprising a casing, contact terminals connected tobut insulated from the casing, contactl springs carried by the terminalsand extended into the casing, instrument receiving tubes, heatin coils surrounding the tubes, an insulate block covering the tubes andthe coils and havin the terminals of the coils projecting there om to engage the springs and a cover removably secured on the casing for holding the terminals of the 'coils' in engagement with the springs, said cover being apertured to register with the instrument tubes.

In testimony whereof I aiiix my signature a in presence of two witnesses.

` CHARLES C. HEYDER. Witnesses:v

l ELIZABETH GLASS, J. ROSE HUNTER. 

